One of the ingredients in a washing powder is sodium hydrogencarbonate, $\text{NaHCO}_3$. During a titration, $1.00\,\text{g}$ of the washing powder is found to need $7.15\,\text{cm}^3$ of $0.100\,\text{mol dm}^{-3}$ sulfuric acid for the reaction to go to completion. Sodium hydrogencarbonate is the only substance in the washing powder that reacts with the acid. Determine the percentage by mass of sodium hydrogencarbonate in the washing powder?
- A$3.0\%$
- B$6.0\%$
- C$12.0\%$
- D$24.0\%$